Machine for threading bolts



' No Model.) 2 Sheets-Sheet 1. M. D. LUEHRS;

MACHINE} FOR THREADING BOLTS. j

Patented Dec. 5, 1882.

22 MAO, M4, MENTOR y N. PEIERS. Pfmol-ilbognbhw. Winhingim D. I.

(No Model.) 2 Sheets-Sheet 2. M. D. LUEHRS.

MACHINE FOR THREADING BOLTS. 110,268,508. Patented Dec. 5. 1882.

jgnmsszik d0 INVENTOR flv 9%flTTORNEY s N. PETERS. Piwlu-Lilhognlpher. Wnhinglon. n. c.

UNITED STATES PATENT OFFICE.

MIUHEL D. LUEHRS, OF CLEVELAND, OHIO.

MACHINE FOR TH READING BOLTS.

SPECIFICATION forming part of Letters Patent No. 268,508, dated December 5, 1882.

Application filed May 26, 1882. (No model.)

.To all whom it may concern:

Be it known that I, MICHEL D. LUEHRS, of Cleveland, in the county of Ouyahoga arid State of Ohio, have invented certain new and useful Improvements in Machines for Threading Bolts; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as willenable others skilled in the art to which it pertains to make and use the same.

My invention relates to bolt-cutter heads;

, and it consists in the peculiar construction of the same, as will be hereinafter full y set forth and claimed.

1n the drawings, Figure 1 is a view in longitudinal vertical section of a bolt-cutter head constructedaceording to .my invention, showing the manner of operating the die-ring. Fig. 2 is a plan view of the die-ring-operating mechanism, showing more clearly its construction. Fig. 3 is a view in longitudinal vertical section of my bolt-cutter head, showing the manner in which the die-ring operates the dies. Fig. at is a plan view of the face of my cutter-head.

A is the head of my bolt-cutter.

B B are thread-cutting die's, which are fitted in radial slots cut in the face of the head and held in place by means of a face-plate, O.

. D is a die-rin g, which surrounds the head A, and is adapted to slide thereon. The upper ends of the dies, which are made T-shaped, engage with T-shaped slots a a, cut in the ring D, as shown in Fig. 4. The upper ends of the dies B B are made inclined,as are also the bottomwalls of the slots a a. Thus it will be seen that as the ring D is forced outward it will act to force the dies toward the center of the head A, and as the ring D is drawn back it will act to draw the dies from the center of the head, the projections 11 b on each side of the dies engaging with the walls of the recesses c c of the slots.

E is a curved rocking lever, which is pivoted in a recess, 01, cut in the outer surface of the head. (See Figs. 1 and 2.) One arm, 6, of the lever E is attached to the die-ring D by means of a link, F, and an adjustable stud, G. The stud G is connected to the ring D preferably by means of the screw H, which is provided with two screws having a difierent pitch, the coarser screw engaging in the stud G and the finer engaging in the ring D. By thus uniting the stud G and ring D a finer and more positive adjustment can be made between the two, and it also prevents any lost motion be- 5 tween the parts. The object in adjusting the stud G is to lengthen or shorten the distance between the ring and arm 6 of the lever E, which acts to regulate the distance to which the ring D shall move forward, and hence it also regulates the distance to which the dies B B shall travel toward the center of the head A. (See Fig. 3.) The rear arm,f, of the lever E is curved upward, as shown in Fig. 1, and a ring, I, which rests between the two arms 0 6 andf of the lever E, acts, when it is drawn back, to depress the arm f of thelever E, which in turn acts to elevate the arm 6, and also to draw said arm 6 backward, and with it the ring D, which is connected thereto by the link F and stud G. This acts to open the dies B B, as will be readily seen. By reversing the motion of the ring I the ring D is driven forward and the dies closed.

Any suitable mechanism may be employed 7 to operate the ring I, which may be done either automatically or manually, as desired. One lever E and connection with the ring. D is all that is necessary in small machines; but when it is desired, as it is in larger machines, to use two levers to operate the ring D, I do not connect the adjusting-ring D to one of the studs G, but allow the screw H only to abut against. the stud G, as shown in Fig. 1. By thus'connecting but one of the studs to the ring D, I obviate the necessity of moving each of the screws at the same time and in the same direction to prevent the straining of the parts, as would be necessary were both of the stnds'and screws connected. It is not, even in the larger- 93 machines, necessary to connect but one of the studs to the ring, as the inclines on the diesB' B, and in the upper part of the slots at a, always tend to force the ring D back.

What I claim is-- 95 1. In a bolt-threading head, the combination, with dies and a longitudinally-sliding ring iorimparting radial movement to the dies, of a two-armed lever, pivoted to the head, de vices for connecting one arm of said lever to 1oo the sliding ring, and devices for engaging the other arm of said lever for rocking ,it on its piuotal bearing, and thereby moving the slidoperating ring D, one of said studs only being ring, substantially as set forth. ing connected to the said ring D,- substan- 2. In a bolt-threading head, the combinatially asshown and described. tion, with the lever E, and a means for oper- In testimony whercofI have signed my name 5 ating said lever, of a connecting-link and an to this specification in the presence of two sub- 1 5 adjustable stud secured to the die-ring, subscribing witnesses.

stantially as shown and described. MICHEL D. LUEHRS. 3. In a bolt-threading head, the co'mbina- Witnesses: tion, with two levers, E E, and ring I, for op- A. W. BRIGHT,

IO erating the same, of the studs G Gr and die- W. E. DONNELLY. 

